Dry-kiln.



H. HUNTER.

DRY KILN.

APBLICATION FILED JAN.2,1913.

Patented July 22, 1913.

514 ne M from In f77 d n fz zff;

l H @01u13 UNITED STATES PArENT onirica.

Henny HUNTER, or 1Nn1ANAPoLIs,'INiJi;ANA.

DRY-KILN.

Specification of Letters Patent.

Application tiled January 2, 1913. Serial No. 739,649.

Patented July 22, 1913.

.and hardened at a rapid rate, without injury to the articles. l v The accompanying drawingsl illustrate my invention. Figure V1 is a vertical transverse'section,

` substantially on the line 1-1 oflFig. 2, of

a vdr kiln constructed in accordance. with my invention; Fig. 2 is a section on the line 2'-2 of Fig- 1; Fig. l3 is a reduced section on the line 3-3-of Fig. 1; Fig. 4 is a section on the line 4-4 of Fig. 2; and Fig.

5 is an enlarged detail 'of the recirculation controlling device.

A substantiall ment is formed ,y end walls 5 and 6', side walls 7 and 8, and a ceiling i), all of which are preferably properly heat insulatedy and one ormore ofthe walls being prfbvided f i with a. door 11. A horizontal partitioii 13 is located within this compartment `and-nearA the ceiling, said partition being spacedl from two opposite walls of the rooinlaisf shown `in Fig. 1, but preferably extending .the entire distance between the other twg) walls as shown in Fig. 3. 'lwo vertical parititions 14 and 15 extend downward from the' two edges of the horizontal partition.. 13

which are spaced from the'sidewall's ofthe'ff is between the partitions 14 and 15 and be! neath the partition 13. A water pan 16, conveniently extending substantially the entire length of the compartment as shown in I Fig. 3, is located at the lower edge of the passage' between the partition 14 and the adjacentside Wall 7 yandina with steam heating pipes 17 if desired. l

Within the space between the partition. 15 and the adjacent side wall 8 is locate-da set of heating pipes 20, said pi es terminating at one end in a vertical hea er 21 connectedl to th supply pipe 22 and at the other end closed room or compart-v be .providedy lower part ofthe space betweeithev partition 15 and said wail-l, their inner endsopem ing upward beneath the steam fpips 20. A second series of elbow-pipes `31,project vthrough the partition'15 near `thefbottom thereof and extend upward in the space betweeir such partition vand -thewall 8, terminatin at their upper ends in .a horizon tal hea er 32 extending lengthwise of such space and communicating with' the atmos-I phere through a discharge pi'p'e 33 extending through the ceiling 9. 'The header 32 is also provided with a'series of small discharge pipes 34, which open upwardly beneath such ceiling.' The `pipes'34'1ina'y be provided ywithdarnpers 35 pivoted at 36 and having projections 37 cooperating with arms 38 on a common adjustin shaft 19 having at one end an operating -andler 40..

In operation, the air within thejspace be# tween the partition 15 and the sidewall 8, as well as the air within the pipes'31 and the header 32, is heated by thesteam pipes 20, so that there is created a tendency for such air to rise. This causes air to be drawn into such space through the pipes 30 and air to be `drawn out of the diyingvchamber between the partitions 14 and 15 and beneath the horizontal partition 13 through. the pipes 3l,`this latter air passing'pa'rt to the atmosphere through the pipe 33. und -part buck into the space within the closed compartment through the pipes 34. Thus a continual circulation of air is produced, the

air passing upwardly through the space be- The header r24 rdischarges tween the partition 1'5 and the .wall 8, horizontally in the space between the horizontal partition 13 land the ceiling 9 downwardly between the partition 14 and the adjacent side walls, thence into the drying chamber, and thence lout-through the' pipes 31, the

header 32, and the discharge 'pipe 33. By. yreason ofthe pipes 34, some. of theair circulates,4 and at the Sametime fresh airis continually being supplied through the pipes to take the place ofvthat which is discharged through the pipe 33. The pro- .f

portionate part of the air which re-circulates is controlled as desired by adjusting the arm and the dampers 35 operated thereby. The air is properly humidified at the water pan 16 before it passes into the drying chamber.

I claim as my invention:`

1. A dry kiln consisting of a main or outer compartment and an inner compartment spaced from the outer compartment at the top and at two opposite sides, the space within the inner compartment co1nmunicat-` ,i nig with the space between the two compartments substantially at the bot-tom of one of the side walls of the inner compartment,

pso

a heating coil in the spacebetween t e opposite side wall of the inner `compartment and the adjacent side wall of the outer compartment, an air inlet passa-gel leading from the atmosphere into the lower part of such lastnamed spaceandn air passage leading to the atmosphere from the inside of the spacefwithin the inner compartment, said last namedypassage having a branch passage opening 'into the space between the inner and outer compartments.

2. A dry kiln consistingr of.a main or outer compartment and an inner compartment spaced from the outer compartment at the topand at two opposite sides, the space.

within the inner compartment communicating with the space between the two compartments substantially at the bottom of one ofY the side walls .o theA inner compartment, a

heating coil inthe space between theoppo- `site side wall of the inner compartment and the adjacent side wall of the outer compartment, an air inlet passage leading from the atmosphere into thelower p art of such last named space e ,and an air passage leading through said last named space to the atmosphere from the inside and near the bottom of the vspace within the inner compartment. 3. Ay dry kilnconsisting of a main or `outer` compartment `and an inner compartment spaced from,th-e outer compartment at l,the top and a two opposite sides, 'the space within the i1 er compartment communicatingwith Athespace betweenfthe two compartments substantially at the bottom of one of the side walls of the inner compartment,

.I a heating coil `in the space between the opposite side-wall of the inner compartment and Ethefadjacent side wall of the outer compartment, an air, inlet passage leading from the tatmosphere into the lower part of such last ,namedf space, and an air passage leading through vsaid last .named space to the atmosphereirom the inside and near the bottom of thespae withintlie inner compartment,

said last named passage having ,a branch passage opening into the space between the lnner/and outer-` compartments.

4. A dry kiln consisting of a main or outer compartment and an inner compartment spaced from the outer compartment at the top and at the two opposite sides, Vthe space within the inner compartment commu nicating with the space between the two compartments substantially at the bottom of one of the side walls 'of the inner compart7 ment, a heating coil in the space between the opposite side wall .of the inner compartment and ,the adjacent side wall of the outer compartment, an air. inlet passage leading from the atmosphere into the lower part of such last named space and an air passage-leading through said last named space to the yatmosphere from the inside of thespace within the inner compartment. i

5. A dry kiln consisting of a main or outer compartment 'and an inner compart-l ment spaced from the outer compartment-at' "the top and at two opposite sides, the space within the inner compartment communicat 'ing with the space between the two coin-- l partments substantially at the bottom of oneI ofthe side walls of the inner compartment, a heating coil in the space between 't e .op-o` posite side Wall of the inner compar ment and the adjacent side wall of the outer compartment, an air inlet .passage leading from the atmospherev into the lower., part of such last named space, and an air passage leading v to the atmosphere. from the inside and near" the bottom of the compartment. f

f 6. A dry kiln consisting of a inai'njcii;` outer compartment and an inner compartment spaced from the outercompartmentat rthetop and at two opposite sides, thespace sage leading to the atmosphere from the in-' sideof the space within the inner compart ment. y

i 7 A dry kiln consisting of a main or outer compartment and an inner compartment spaced from the outer compartmentat the top and at two opposite sides, the space within the inner compartment communicating with the space between the two compartments substantially at the bottom of one .of the side walls of the inner compartment,

space within the inner' a water pan arranged at such point of coml munication, a heating coil for heating the contents of said water pan, a heating coil in,

the 'space between the opposite side wall of the lnner compartment and the adjacent Yside wall of the outer compartment, an air inlet passage leading from the atmosphere into the lower part of such last named space, and an air passage leading to the atmosphere from the inside of the space within the inner compartment.

8. A dry kiln consisting of a main or outer compartment and an inner compartment spaced from the outer compartment at the top and at two opposite sides, the space within the inner compartment communicating with the space between the two compartments substantially at the bottom of one of the side walls of the inner compartment, a water pan arranged at such point of communication, a heating coil in tbe space between the opposite side wall of the inner compartment and the adjacent side wall of the onter compartment, an air inlet passage leading from the atmosphere into the lower part of suc last named space, and an air passage leadi g to the atmosphere from the inside of the space within the inner compartment.

9. A dry kiln consisting of a main or outer compartment and an inner compartment spaced from the outer compartment at tne top and at two opposite sides, the space within the inner compartment communieating with the space between the two Compartments substantially at the bottom of one of the side walls of the inner compartment, a heating coil in the space between the opposite side wall of the inner compartment and the adjacent side wall of the outeracompartment, an air inlet passage leadingtgtrom the atmosphere into the lower part ,ofi such last named space,jand an air passa Ae leading to the atmosphere from the insi e of the space within the inner compartment.

10. A dry kiln consisting of a main or outer compartment and an ilmer compartment spaced from the outer compartment at the top and at two opposite sides, the space within the inner compartment communicating with the space between the two compartments substantially at the bottom of one of the side walls of the inner compartment, a heating coil in the space between the opposite side -wall of the inner compartment and the adjacent side wall of the outer compartment, an air inlet passage leading from the atmosphere into the lower part of such last named space, and an air passage leading to the atmosphere from the inside of the space within the inner compartment, said last named passage having a branch assage opening into the space between the lnner and outer compartments, and means for controlling the proportionate part of the air which passes through said branch passage.

11..A dry kiln consisting of a main or outerI compartment and an inner compartment spaced from the outer compartment at the top and at two opposite sides, the A space within the inner compartment communicating with the space between the two compartments substantially at the bottom of one of the side walls of the inner conipartment, a heating coil in the space between the opposite side wall of the inner compartment and the adjacent side wall of the outer compartment, an air inlet passage leading from the atmosphere into the lower part of such last named space, and an air passage leading through said last named space to the atmosphere from the inside and mear the bottom of the space within the inner compartment, said last named passage -havin ranch passage o ening i to the space' etween the inner an outer compartments, and' means for controlling `the pro- 'portionateA art of the air which passes through branch assage.

In witness where() I have hereunto set my hand at Indianapolis, Indiana, this 11th day of Apnil, A D. one .thousand nine hundred and thirteen. f.

'HARRY HUNTER.

Witnesses FRANK FABLE,

. G. B. SGHLEY. 

